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Cu-modified cryptomelane oxide as active catalyst for CO oxidation reactions

Paper ID Volume ID Publish Year Pages File Format Full-Text
46119 46430 2012 9 PDF Available
Title
Cu-modified cryptomelane oxide as active catalyst for CO oxidation reactions
Abstract

Manganese oxide octahedral molecular sieves (cryptomelane structure) were synthesized by a solvent-free method and tested in the total oxidation of CO (TOX), and preferential oxidation of CO in presence of hydrogen (PROX). The influence of Cu in the cryptomelane structure was evaluated by several characterization techniques such as: X-ray fluorescence (XRF), thermogravimetric analysis (TGA), hydrogen temperature programmed reduction (TPR-H2) and X-ray photoelectron spectroscopy (XPS). The Cu-modified manganese oxide material (OMS-Cu) showed very high catalytic activity for CO oxidation in comparison to the bare manganese oxide octahedral molecular sieve (OMS). The improved catalytic activity observed in OMS-Cu catalyst was associated to a high lattice oxygen mobility and availability due to the formation of CuMnO bridges. In addition, under PROX reaction conditions the catalytic activity considerably decreases in the presence of 10% (v/v) CO2 in the feed while the same amount of water provokes an improvement in the CO conversion and O2 selectivity.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ Cryptomelane-type manganese dioxide materials for CO oxidation reactions. ▸ Mn–Cu interaction improves the catalytic activity of the cryptomelane structure. ▸ Catalytic activity in CO oxidation is related to the high lattice oxygen mobility. ▸ Application in the preferential oxidation of CO in presence of H2.

Keywords
CO oxidation; Manganese oxides; Octahedral molecular sieve (OMS); Cu-modified cryptomelane
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Cu-modified cryptomelane oxide as active catalyst for CO oxidation reactions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 123–124, 23 July 2012, Pages 27–35
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us